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Credit Agreement - Schedule of Credit Agreement (Parenthetical) (Detail) - Credit Agreement [Member] - USD ($)		Dec. 31, 2019	Dec. 31, 2018
Line Of Credit Facility [Line Items]
Outstanding letters of credit	[1]	$ 2,218,000	$ 2,218,000
BMO Harris Bank N.A. ("BMO Harris") [Member]
Line Of Credit Facility [Line Items]
Outstanding letters of credit			300,000
BMO Harris Bank N.A. ("BMO Harris") [Member] | Letter of Credit [Member]
Line Of Credit Facility [Line Items]
Letters of credit, sublimit and aggregate commitments		50,000,000.0	50,000,000.0
BMO Harris Bank N.A. ("BMO Harris") [Member] | Letter of Credit Sublimit [Member]
Line Of Credit Facility [Line Items]
Letters of credit, sublimit and aggregate commitments		$ 25,000,000.0	$ 25,000,000.0
[1] As of December 31, 2018, outstanding letters of credit not related to the credit agreement totaled $0.3 million, fully collateralized with restricted cash.

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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- Details

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- Details

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